adjectiveEtymology: Greek seismos shock, earthquake, from seiein to shake; probably akin to Avestan thwaēshō fearDate: 18581. of, subject to, or caused by an earthquake; also of or relating to an earth vibration caused by something else (as an explosion or the impact of a meteorite)
2. of or relating to a vibration on a celestial body (as the moon) comparable to a seismic event on earth
3. having a strong or widespread impact ;earthshaking<

Seismic — Seis mic, Seismal Seis mal, a. [Gr. seismo s an earthquake, from sei ein to shake.] Of or pertaining to an earthquake; caused by an earthquake. [1913 Webster] {Seismic vertical}, the point upon the earth s surface vertically over the center of… … The Collaborative International Dictionary of English

seismic — seis|mic [ saızmık ] adjective 1. ) relating to EARTHQUAKES: seismic activity 2. ) causing a very great change in a situation: a seismic shift in people s attitudes … Usage of the words and phrases in modern English

seismic — UK [ˈsaɪzmɪk] / US adjective 1) science relating to earthquakes seismic activity 2) causing a very great change in a situation a seismic shift in people s attitudes … English dictionary